The phrase "whose main responsibility is" is correct and usable in written English.
It is typically used to describe someone's job or purpose and can be used in the middle or at the end of a sentence. For example, "The manager of the team, whose main responsibility is ensuring everyone is working hard, is in charge of the project."
Regional seas organisations, whose main responsibility is to cut pollution, generally do not cover the same areas as regional fishery bodies, and the two rarely work well together.
That's a pretty spectacular achievement, particularly for a person whose main responsibility is to break ties in a State Senate that contains only six Republicans.
One of those in the circle is Sir David Omand, Mr Blair's security and intelligence coordinator whose main responsibility is domestic security.
Critics still say it is unrealistic to expect private companies, whose main responsibility is to their shareholders, to assume the financial risk of supplying water to portions of the world's population that may not be able to afford it in the first place.
His partner, who sometimes turns up on the program to schmooze about the records or help interview a guest but whose main responsibility is turning the often murky sound of the old records into broadcast-quality music, is Richard Shulberg, better known to listeners as Citizen Kafka.
Many partner communication leads are primarily researchers, whose main responsibility is to actually carry out the research.
Trimeris Inc. said its president, Nixon Ellis, whose main responsibility was overseeing development of the now-approved H.I.V. medicine Fuzeon, would leave the company.
But for the past nine years as a deputy mayor whose main responsibility was to oversee the Department of Education, he has left only the faintest of fingerprints during a time of momentous changes to the schools.
Many wingers could have complained or just floundered after being asked to play as a centre-forward whose main responsibility was to drag defenders out of position with selfless runs.
His formal statements are filled with multisyllabic upper-crust phrasing -- his campaign had an intern whose main responsibility was to look up all the unfamiliar words Mr. Kerry uttered -- but one on one, he calls strangers "man" or "brother".
Most local rangeland communities in Uganda had a hierarchical system of elders whose main responsibility was determining rangeland use patterns and enforcing traditional norms and values regarding rangeland use and livestock production, to ensure that range productivity was sustained (Rugadya and Kamusiime 2013).
